# 从0开始，不包含端点值
for i in range(10):
     print(i)

#  开始点 和终止点 不包含端点值
for i in range(1,10):
    print(i)
for i in range(1,20,3):
    print(i)

a = ['a','b','c','d']
for i in a:
    print(i)